Report of the chromosome numbers of some Costa Rican anurans

Abstract

The chromosome numbers of 21 Costa Rican anurans, representing eleven genera and seven families were determined from testicular meiotic cells stained with propiono-orcein. In this group higher numbers are generally present in the more primitive taxa. Dendrobates auratus and Eleutherodactylus podiciferus present a haploid number of 9, the lowest reported among anurans. The highest haploid number, 13, was found in members of the Hylidae, Microhylidae and Ranidae.